Indotech Devices Pvt. Ltd. Offers Three Phase Selector Switch Type Ammeter. Indotech Devices Pvt. Ltd. Is an ISO 9001:2008 certified company. Indotech Devices Pvt. Ltd. Supplies indicating test & measuring instruments. Three Phase Selector Switch Type Ammeter consists of single row of LED display. The phase selection in Three Phase Selector Switch Type Ammeter can be done with the help of "SCROLL" switch which is provided under the dial of the meter. A red LED lights up indicating the phase whose current is being displayed. The CT Ratio can be set with the help of "Dip Switch" which is available on the back of the meter.